package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Employee;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.DishEnableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @Auther: Tangguo
 * @Date: 2023-04-23  20:51
 * @description: 菜品管理
 */

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * @param dishDTO:
     * @return void
     * @description 新增菜品和对应的口味
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);//后绪步骤实现

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /**
     * @param dishPageQueryDTO:
     * @return PageResult
     * @description 菜品分页查询
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());

    }

    /**
     * @param ids:
     * @return void
     * @description 菜品批量删除
     */
    //添加事务
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    /**
     * @param id:
     * @return DishVO
     * @description 根据id查询菜品和对应的口味数据
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * @param dishDTO:
     * @return void
     * @description 根据id修改菜品基本信息和对应的口味信息
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {

            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /**
     * @param status:
     * @param id:
     * @return void
     * @description 起售停售菜品
     */
    public void startOrStop(Integer status, Long id) {
        //停售菜品时，先判断与菜品相关联的套餐是不是在起售状态
        if(status==StatusConstant.DISABLE){
            //1.1根据菜品id查询与之关联的套餐
            List<Setmeal> setmealList = setmealMapper.getByDishId(id);

            setmealList.forEach(setmeal -> {
                if(setmeal.getStatus()==StatusConstant.ENABLE){
                    throw new DishEnableFailedException(MessageConstant.DISH_ENABLE_FAILED);
                }
            });

        }
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);
    }


    /**
     * @param categoryId:
     * @return List<Dish>
     * @description  根据分类id查询菜品
     */
    public List<Dish> list(Long categoryId) {
        DishPageQueryDTO queryDTO= new DishPageQueryDTO();
        queryDTO.setCategoryId(Math.toIntExact(categoryId));
        queryDTO.setStatus(StatusConstant.ENABLE);
        return dishMapper.page(queryDTO);
    }

   /**
    * @param dish:
    * @return List<DishVO>
    * @description 条件查询菜品和口味，多表查询
    */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<DishVO> dishVOList = dishMapper.listWithFlavor(dish);

        return dishVOList;
    }


}
